丙二酸溶液中的铝阳极氧化研究  

Aluminum anodization in malonic acid electrolyte

作　　者：任建军[1] 左禹[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《北京化工大学学报（自然科学版）》2013年第1期63-68,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

摘　　要：在丙二酸电解液中进行了铝阳极氧化,并采用扫描电镜(SEM)、X射线衍射(XRD)及显微硬度仪对氧化膜的构型、物质结构、耐酸性、显微硬度等进行了表征。结果表明,丙二酸电解液的黏度随浓度的升高而增大,电解液黏度较大时,氧化膜的生长速率会明显降低;电流密度较大、氧化时间较长时能显著提高氧化膜构型的规整度;氧化膜膜厚的增长速率呈现出先增大后降低的规律;在相同的氧化条件下,电解液浓度较大时,得到的氧化膜的厚度也较大。在800℃以上对丙二酸氧化膜加热,原来无定型的氧化铝会结晶生成γ-Al2O3;氧化膜结晶后其耐酸性会显著提高。丙二酸电解液的浓度对氧化膜的显微硬度没有显著影响,氧化膜硬度对膜厚的依赖存在一个极限值,约为27μm。Anodic aluminum oxide （AAO） films have been prepared in malonic acid electrolytes. The film mor- phology, crystalline structure, and resistance to acidic dissolution were studied by scanning electron microscopy （SEM） , X-ray diffraction （XRD） , and the hardness was investigated by micro-hardness testing. It was found that the electrolyte viscosity increased with increasing concentration and that higher electrolyte viscosities resulted in a marked decrease in film growth rate. When applying high current densities for long anodizing durations, AAO films with a relatively high degree of order can be produced. The growth rate of the film layer initially increased and then decreased gradually; under similar anodizing conditions, thicker film layers were formed with higher electrolyte con- centrations. The amorphous film material was transformed into γ-Al2O3 by heat-treatment above 800 ℃ and the re- sistance to acid dissolution increased remarkably when the AAO film was crystallized. The electrolyte concentration had no evident effect on film hardness and the film hardness attained a relatively stable value when the film thick- ness was increased to about 27 μm.

关 键 词：铝阳极氧化膜 丙二酸 氧化铝 单元 

分 类 号：TB321[一般工业技术—材料科学与工程]